Lens-cutting machine



L. Q. PRESBY. LENS CUTTING MACHINE. APPLICATION FILED JUNE IIl 1921.

Patnted May 23 zal@ ` i' holder.

.UNITED Pie;TEIJT QFFI'CE;

LEROY Q. PRRSRY, or. RosToN, iur-issi-iciiUSiaTTsVy ASSic-rNoRi'TOc-LOBRoPTiCAL/I ,j COMPANY, A CORPORATION or MASSACHUSETTS 'i RENS-CUTTING;MACHINE i 4 Y Appiicatiop'ied'iune"1i,

To @'Zfw fiom it mag/,concern Be it known that I, LEROY Q. Pnnsin'a Ycitizen of the-UnitedA States,"and resident of Boston, in'ftliecounty of`Suffolk and State of Massachusetts", have-,invented anilmlprox'fementvin i;ens-Cuttingv Machines, of which Vthe following description, fin'connection with the accompanying drawings, is a specification, likeletters on. the drawings representinglike parts. v y

My present invention isan improved lens cutting machine and relatesparticularly to the lens holding devices. l f A ln the type bf lenscutting machine illustrated by the prior U. S. patent V'to L. Wil,-

'helimNo 1,186,25a, dated June-6, l9l6,and Y in the patent to W. Slade,No. 1,388,774,

Aug. 23,1921, itnhas been found that, inpractise, the glass holdingdevices beingjpivoted eccentrically of the center, permitted aslightdisalinementof the cutter and glass during theinitiationvof thecutting action. With the workliolding member adapted to clamp `the glassto be cut upon a work'support, which member was pivoted at one side ofthe work, and arranged to permit vertical movement' with the raising of4'the work against lthe cutter, it .was found that the cutteiI would notalways trace a true concentric circle on the glass during the continuedvertical movement vof thework and work While thisobjection has beenimmaterial in 'many instances where but a v slight vertical movement.was necessary, yet

in other cases where a considerable vertical movement was requiredbetween the first clamping'of the lens andthe completion of thecutting'actioina considerable disalinement waspossible. My presentinvention vis directed to obviate the difficulties above noted, andtopermit the use of a work clamp- I ing devicepivoted atY one side ofA thework holder and Vpreferably movable or rotatable to allow better view'andvision of` the cutting operation, and also to compensate for thedisalinenient,heretofore found in prior clamping members'which werenecessarilyv pivoted at one side.

In` my present invention I have devised' a work clamping member suitableVfor being mounted on a rotatable'portion iof the machine, and whichmember willitself move verticallyin eXaCtI-alinement with the verticalmovement of the work support during the cutting operation, thus insuringa true Specification of Letters Patent. May

192i. seriaiNol 475,934.'l A

andeXact cutting of the lens. In order to carry lout my said invention Ihave provided clamp holding arm' secured at onepsideof the work-'topermit view and' facilitate the cutting operation, etc.-and which-,isfYse,-

workingin a properly formed'caml path or slot, so as to positively movethe clamp holding arm inwardly or outwardly in--eXactQre-V lation-andproportionlto the vertical movelens in` exactly'the same circle, loops'or form of'tliemodel employed in these machines.` Referring to theattached drawings illus- 65 ment of the work and lens,thusfmaintaintrating a preferred embodiment-ofthe inven'tiong-Q H flFig. l isa side view, partly in'cross-section, illustrating myinvention as applied to the lens cutting machine of the kind andtypeshown-in said Slade patent; i

f Fig. 2 is a lplan view of the clamp 'carrying` arm andf' Y i Fig. 3 isa side'view of the arm.

W'hile 'I' have shown 'in the drawings my invention asiapplied to a:lens cutting machine, and Valthough this isy aprimary :and importantuse to which the' present' invention has been applied, yety itwillbeappreciated that invention, broadly considered, can be applied; with`equal advantage, to other machines orA devices,: wherein aclampingmember is mounted on` an overhanging arm,

lwhich arm is secured'at one side ofthe work,` f and wherein i ayvertical movement of' the 'A clamping member, together` with itsholding'` i i arm, is necessaryV in the operation of the machine.r Myinvention enables this vertical movement to be carried out with a largerange and to positivelymove the clamp carrying armyinwardlyl oroutwardly to compensate for the vertical movement."required,y Y

andthuseliminate the dragging `4 action of the vholding arm onits'clampswhere theholding arm was originally pivoted and Vhad asubstantial swinging action during the mar chine operations.

'Y'Referringto theA drawings, .I havefdesi'gnated in conventional form alens cutting machine of the type "of the said 'lilhelm andk y SladeVpatents,wherein'a basel carries. a rotatable work support 2 mounted forrotation on a gear wheel 3 and with suitable'connections to vupper gears4 and 5, operated manually ork otherwise by a handlemt.A Aleveiffpivoted"at 8'in'the`ba`se l serves'by suitable connections'toraise" and lower the work support 2 against a cutter (not shown)` yheldin cutter holding shaft 10, wliich'cutter is Vmovable inwardly andoutwardlyto follow the contour'o'i a pattern 12.` 'The ciitter holdingdevices provide an adjnstable slide l5 contacting against the edge ofthe pattern ,l2 and coiitrollingthe movements of the .cutter shaft l0and-:its cutter -upon the workwhich latter ishheldV clamped betweenatopI clamping member 2() and the work supi991t2 Y Y gfiinventionhastodo particularly with the holdingof this vupper clamping member 20,which, Vit will bev appreciated, must be rais/edandlowered with theglass to be cut,

held between said clamp 20 and the work V hold-ingfthe *clamp 20 aroundthe work as desired, forming this bracket 21 with'a forwaldly extendingpair of arms `23, 'and spaced asuicient distance to hold betweenthem"alevei `25. `This-.lever vextends/forwardly and has a ball joint orother suitable iiniversal movable eonnectionfwiththe clamp 20,permitting the clamp, 20 to auto'- inatically seat itself' on thegworkwhen' the cl'aiiip, is lowered thereon'.v This lever 25 is also formedwith a rearwardly extending operable portion26, t'o Vfacilitate Vtheaction ofthe-,thumb of the operator in raising the lever and removingthe clamp V20 from the work, a Acorresponding vi'inger resti 27 being i.tion y'whenidesi'red tolremove or replace work.'V Af spring'v 30,' shownin'dotted lines, Fig. 1,

secured to thefbracket 21 and a latchmember 281pivoted 4to the -lever 25at 29 being "also provided to hold the` lever 25 in raised posinormallyacts to hold thev arm 25 ywith the clamp v20 pressed yieldin'gly againstthe work. I-foriiiithe lever 25preferablyvwith a slight curved portionlas shown at 31 for clearance aroundl A,the cutter and" a. better Y view,andvalso cut in this lever apair of cam vpaths 32and 'Thesef'cam pathsor slots receive rods 35 and" 36 respectively which are held rigidly inthe 5 spaced arms 23. at

either side ct the lever 25 andpermit the pivotal `action of the'lever251duringthe raising and lowering of the clamp 20 under the action oi'the 'spring 30 or while compressing said Ispring and ,the raising of,the leveras above: explained, but also: these ycamipaths andv the-studs35 and 36 engaging the same, l

are so formed, constructed and arranged as to give a forward andbackward thrust or i ni'oveinentt'o the entirearin, suiiicient to eX-"actly'compensate for 'the shortening and lengthening of theoutermostfend where the clamp' 2O is attached, which would be theVveffect were theA clampv20 rigidlynpivoted at a single point. Thisconstruction, therefore,

ing of the work againsththe cutter with a Vconsiderable range vofvertical movement withoutdisplacing the exact positionof the clamp20towhich it vhas settled'wlien clamp-v ing the workl onto the worksupport,'pre venting any `dragging of the clampA 2O trom its originalposition bythe raisingandlowei'ingof the lever 25.-v

lpermits the clainp2() to be readily raised Y and lowered during theraising and lower- Vvso y It'will bejappreciated that' I lam enabled tothus accurately and positively compenl t sate for the disalinement which`woiild fbe and ,heretofore has been caused byl the raising and loweringofthe lever 25 if ixedon arigid pivot, Asuch.,disalineinent increasingduring the lgreater extent otthis vertical `movement as the' clamp201isfliftedor lowered'ffrom a strictly lhorizontal position. Ylferitectprecision is.V thusaccorded the cutting machine during the raisingV andlower- Y i ing ofthe work. j Y- li/ily invention ,is further describedand defined iiizthe form of claims as follows:

l. In a machine of the kindy described, a

work'support thereon, a bracket mounted on the base and vat one sideotithewor'ksupport, studs on said bracket, a lever, anda work clampadapted to be held and supportedby s'aid lever, said lever having` camslots Y coeoperating with the-'studs onthe bracket tolimit the clamp tomovement in 7^a vertical direction. l

,2. ln a lens cutting machine, having a base, 'a vertically movable worksupport thereon, a bracket Aon said base and posi'- tiened at one yside'of the work support and adapted to rotateY tlierearound, said bracketlhaving apair ot extending arms, azleveripositioned between said arms,and extending iio concentricallyrover the worksupport, said lever being.provided with a pair ofycain y slots,a 'clamplcarried'by4 the lever inposi-Y tion to lcooperate withsaid work support, and val pair oftixed-vstuds'extending. through Vsaid cam paths and Ycarriedbythebracket arms so constructed and arranged as to move the clamp'icarrying lever elliptical ly and limit the clamp to verticalmovementonly'v during the vertical movement off'th'e Work f support.

.In :testimony whereof, I namet'o this specification.

Lenovo. iRiisBY.

have signedV my

